Hydraulic trimming attachment



Feb. 29, 1944. j l.. H. MORIN HYDRAULIC TRIMMING ATTACHMENT Filed July31, 1942 INVENTOR au/s Mon/,v

Y 2%4, M '6W ATTORNEYS .ql-Ju. n

Patented Feb. 29, 1944 UNITED STATES rATENr OFFICE HYDRAULIC TRIMMINGATTACHMENTI| Louis H. Morin, Bronx, N. Y., assigner of onehalf to DavisMarinsky, Bronx, N. Y.

Application July 31, 1942, Serial No. 453,009

e ally coupled projecting rods I2 and i3 respec- 20 Claims.

This invention relates to die casting machines, in which castings arerst formed, and then trimmed before being discharged from the machine.More particularly, the invention relates to a hydraulically actuatedtrimming attachment for casting machines of this type and kind whereinthe required pressure may be provided to perform the trimming operationin a simple and practical manner While maintaining relatively high speedproduction in the casting machine. The novel features of the inventionwill be best understood from the following description when takentogether with the accompanying drawing, in which certain embodiments ofthe invention are disclosed, and in which the separate parts aredesignated by suitable reference characters in each of the views, and inwhich:

Fig. 1 of the drawing rep-resents a diagrammatic sectional View of oneform of attachment, and;

Fig. 2 is a view similar to Fig. 1 showing only a part of the machin-econstruction, and showing a, modication.

In trimming die castings in casting machines of the type, for example,illustrated in application Serial Number 347,426, filed July 25, 1940,quite often lconsiderable pressure is required to perform trimmingoperations, and particularly in trimming fairly large castings. It alsopresents a problem in operating a, machine at high speed. Efforts havebeen made to solve this problem by the use of large fly wheels, but theuse of such fly wheels is not practical in that it is difficult tointerpose a safety throw-out in machines of this type and kind.

I overcome the present diiiiculties by providing a hydraulicallyactuated trimming tool which will provide the required pressure forperforming the trimming operation and by reason of the use of thishydraulically actuated tool, well known electrical safety throw-outs canbe employed to control the operation of the tool in the event ofimproper registration of the casting with the tool, or in the event ofthe' presence of any foreign material in alinement -with the workpieceand tool. In addition to the hydraulic actuation of the trimming tool,mechanical means is also provided to move the trimming tools toward andfrom each other in permitting the automatic feed of the workpiece intoposition between said tools and in feeding the workpiece to a positionprep- 1aratory to the nal hydraulic trimming operaion.

In the diagrammatic illustration I3 and II represent two plungers orslides to which are pivottively. Supported on adjacent surfaces of theslides Il! and II are a punch trimming tool I4 and a plate trimming toolI5 respectively, the latter having an 'aperture I3 for receiving thepunch, and this aperture opens into a recessed portion I 'I of the slideII, from which the resulting trimmed castings I8 may be ejected.

Arranged at opposite sides of the slides IQ and II are cam shafts I9 and20 each supporting dual cams 2l, 22. Pivoted adjacent each cam shaft asseen at 23 are double bell cranks 24, one lever of each of whichsupports a roller 25 which operates upon the cams 2|. Another lever ofeach crank supports a roller 26 which operates upon the cam 22, and thethird lever of one bell crank is pivoted to an extension 21 on ahydraulic cylinder 28 as seen at 2S, and the other to the free end ofthe rod I3, as seen at 3Q.

The rod I2 extends into the cylinder 28 through a suitable stufng box orpacking gland structure 3l, and has within the cylinder a piston 32. At33 and 34 are shown 4ports for admitting the hydraulic medium to thecylinder at opposite ends of the piston 32 to positively move thep-iston in both directions. When the hydraulic medium is introduced intothe cylinder through the port 33, the punch trimming tocl I4 moves theworkpiece I8 in the direction of the trimming tool I5 in performing thetrimming operation, to trim the gate and any flared metal 35 which mayprevail on the casting,.therefrorn. In this operation of the trimmingtool the casting is projected into the recess I'I and is automaticallydischarged from the machine as is diagrammatically indicated.

In the operation of the trimming attachment herein diagrammaticallyillustrated, it will be `apparent that the cams 2l and 22 operating uponthe bell cranks 24, mechanically controly the movement of the tools Itand I5 toward and from each other in separating the tools for the po-Vsitioning of a casting therebetween, and then in feeding the toolstoward each other preparatory to the final trimming stroke which isperformed by the admission of the hydraulic medium to the cylinder 28,from any suitable source of supply, through the port 33. Upon completingthe trimming operation, the flow of the hydraulic medium is reversed andadmitted through the port 34 and the tools are then again separatedpreparatory to receiving the next casting to be trimmed.

Fig. 2 of the drawing is shown as a slight modicaton of the structureshown in Fig. 1, wherein Ill represents a slide similar to the slide lilof l. The cam shaft I6 with the cams 2|, 22, and the associated bellcrank 2li, pivoted as at 23 and supporting the rollers 25 and Zt, arealso similar to the showing in Fig. l. With this construction the pivot2S of the bell crank lever is pivoted to one link 5% of a toggle linkarrangement, instead of extension E? as in F l.. Also substituted forthe rod l2 is another link 3'! of the togglethe link being pivoted asseen at 5:28 to the slide ill and the two toggle links 3S and 31 arepivoted to each other and to piston rod 39 as seen at d.

On the rod 33 is a piston ll operating in a cylinder l2 into which ahydraulic medium is adapted to be admitted through the port i3 inactuating the piston 4| to close the toggle links 36, 3l in moving thetrimming tool in' its trimming operation.

With the construction shown in Fig. instead of hydraulically moving thepiston il in the opposite direction to release the toggle, a spring alis employed which will automatically release the toggle and withdraw thetrimming tool upon the exhaust of the hydraulic medium through the portd3. The cylinder il?. is preferably supported on a pivot 45, whichallows the cylinder to compensate for the mechanical movement of theslide lil through the actuation of the bell crank 24 by the cams 2l and22.

Aside from the modifications noted the structure of Fig. 2 will beotherwise the same as that diagrammatically illustrated in Fig.

It will be apparent that while the foregoing description dealsspecifically with the operation of trimming tools, that this is donesimply to illustrate one adaptation and use of the invention. The meansfor applying the hydraulic power to mechanically operated parts at apredetermined stage in the operation of said Part is applicable to otheruses Where it is desirable to produce a final motion throughhydraulically actuated means, and particularly in arranging thehydraulic actuated means between the part to be moved and the mechanicalmeans for imparting motion thereto.

It will also be apparent that the particular type and kind of trimmingtools employed will depend entirely upon the casting or workpiece whichis being trimmed.. Y

It will also be understood that in both forms of construction disclosedthe cams engage the toggles to form backings in the hydraulic actitationof the trimming tool.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A trimming attachment for .die casting machines, comprising a pair oftool supporting members, mechanical means for each of said membersadapted to move said members toward and from each other during atrimming operation, and means actuated yhydraulically and independentlyof said mechanical means, for op erating one of said members inperforming the trimming operation on said workpiece.

2. A trimming attachment for die castim;r machines, comprising a pair oftool supporting members, mechanical means for each or" said membersadapted to move said toward and from each other during a trimmingoperation, means actuated hydraulically and independently ofi seidmechanical for o erating one of said members in performing the trimmingoperation on said workpiece, and said last named means being interposedbetween one member and the mechanical means for actuating said member.

3. A trimming attachment for die casting ma chines, comprising a pair oftool supporting members, mechanical means adapted to move said memberstoward and from each other during a trimming operation, hydraulicallyactuated means for operating one of said members in performing thetrimming operation on said workpiece, said last named means beinginterposed between one member and the mechanical means for actuatingsaid member, the mechanical means actuating said members comprising bellcranks in operative engagement with said members, and cams for actuatingsaid bell cranks.

4. A trimming attachment for die casting machines, comprising a pair oftool supporting members, mechanical means adapted to move said memberstoward and from each other during a trimming operation, means actuatedhydraulically and independently of said mechanical means, for operatingone of said members in performing the trimming operation on saidworkpiece, said last named means being interposed between one member andthe mechanical means for actuating said member, said hydraulicactuatinfT means comprising a cylinder, a piston in said cylinder, meanscoupling the piston with the hydraulically actuated member, meansadmitting a hydraulic element to the cylinder to advance the pistontherein in the trimming stroke of said member, and other means formoving the piston in the cylinder in the oposite dire'ction.

5. A trimming attachment for die casting machines, comprising a pair oftool supporting members, mechanical means adapted to move said memberstoward and from each other during a trimming operation, means actuatedhydraulically and independently of said mechanical means, for operatingone of said members in performing the trimming operation on saidworkpiece, said last named means being interposed between one member andthe mechanical means for actuating said member, said hydraulic actuatingmeans comprising a cylinder, a piston in said cylinder, means couplingthe piston with the hydraulically actuated member, means admitting ahydraulic element to the cylinder to advance the piston therein in thetrimming stroke of said member, other means for moving the piston in thecylinder in the opposite direction, and the coupling between the pistonand said member comprising a toggle linkage.

6. The combination with two members mounted for movement toward and fromeach other, of separate means for actuating said members, each of saidmeans comprising mechanical means for separating said members and forproviding limited movement of the members toward' each other, and atleast one of said members having means actuated hydraulically andindependently of said mechanical means, for imparting additionalmovement to said member.

'7. The combination with two, members mounted for movement toward andfrom each other, of separate means for actuating said members, each ofsaid means comprising mechanical means for separating said members andfor providing limited movement of the members toward each other, atleast one of said members having means actuated hydraulically andindependently of said mechanical means, for imparting additionalmovement to said member, and said hydraulically actuated means beinginterposed between the memascao'zs 3 ber and themechanical means foractuating said member. Y I I f 8.' The combination with twofmembersmounted for movement toward and from each othenof means for actuatingsaid members, said vmeans comprising mechanical means forseparatin-gsaid members and for providing limited movement of themembers toward each other, at least one yof said members having meansactuated hydraulically and independently of said mechanical means, forimparting additional movement to said member, said hydraulicallyactuated means being interposed between the member and the mechanicalmeans for actuating said member, and said hydraulically actuated meansbeing movable to compensate for mechanical movement of said member.

9. The combination with two members mounted for movement toward and fromeach other, of means for actuating said members, said means comprisingmechanical means for separating said members and .for providing limitedmovement of the members toward each other, at least one of said membershaving means actuated hydraulically and independently of said mechanicalmeans, for imparting additional movement to said member, saidhydraulically actuated means being interposed between the member and themechanical means for actuating said member, and said hydraulicallyactuated means comprising a toggle linkage.

10. The combination with two members at least one of which is movabletoward and from the other, of means for mechanically actuating saidmovable member to positively actuate the same toward and from the othermember and for limitin-g movement of the member in `the direction of theother member, and means actuated hydraulically and independently of saidmechanical means, for imparting additional movement of said member inthe direction of the companion member.

11. The combination with two members at least one of which is movabletoward and from the other, of means for mechanically actuating saidmovable member to positively actuate the same toward and from the othermember and for limiting movement of the member in the direction of theother member, means actuated hydraulically and independently of saidmechanical means, for imparting additional movement of said member inthe direction of the companion member, and said hydraulically actuatedmeans comprising parts movably coupled with said member and themechanical means for actuating said member.

12. The combination with two members at least one of which is movabletoward and from the other, of means for mechanically actuating saidmovable member to positively actuate the same in a rst movement towardand from the other member and for limiting movement of the member in thedirection of the other member, means actuated hydraulically andindependently of said mechanical means, for imparting an additional andsecond movement of said member in the direction of the companion member,said hydraulically actuated means comprising parts movably coupled withsaid member and the mechanical means for actuating said member, andmeans for backing up the part coupled with said mechanical means in theoperation of said hydrauically actuated means.

13. The combination with two members adapted to perform an operation ona work piece at least one of saidmembers being movable toward and fromthe other, of means for mechanically actuating said movable member topositively actuate the same and move it into operative relation with theother member and for limiting movement of the member in the direction ofthe other member, means actuated hydraulically and independently of saidmechanical means, for imparting additional movement of said member inthe direction of the companion member to perform said operation on thework piece, said hydraulically actuated means comprising parts movablycoupled with said movable member and the mechanical means for actuatingsaid member, and said parts comprising the links of a toggle structure.v

14. The combination with two members at least one of which is movabletoward and from the other, of means for mechanically actuating saidmovable member to positively actuate the same toward and from the othermember and for limiting movement of the member in the direction of theother member, hydraulically actuated means for imparting additionalmovement of said member in the direction of the companion member, saidhydraulically actuated means comprising a cylinder and a pistonoperating in said cylinder, means connecting said mechanical means withthe cylinder and means connecting the movable member to said piston.

15. In an apparatus employing a member with iirst means positivelymoving said member in opposite directions, second means imparting asecond and further movement to said member in one directional movementthereof, and said second means being actuated independently of saidfirst means and interposed between said member and rst means.

16, In an apparatus employing a member with means positively moving saidmember in opposite directions, means imparting further movement to saidmember in one directional movement thereof, and said last named meansbeing interposed between said member and rst named means for actuatingsaid member and comprising parts movably and independently coupled withsaid member and rst named means.

17. In an apparatus employing a member with means positively moving saidmember in opposite directions, means imparting further movement to saidmember in one directional movement thereof, said last named means beingintei-posed between said member and rst named means for actuating saidmember and comprising parts movably and independently coupled with saidmember and first named means, and said parts being movable relatively toeach other.

18. The combination with trimming tools, of mechanically actuated meansmoving at least one tool toward and from the other tool in positioning aworkpiece between the tools preparatory for a trimming operation, andmeans actuated hydraulically and independently of said Inechanical.means, for operating said tool in performing the trimming operation onthe workpiece.

19. The combination with trimming tools, of means moving at least onetool toward and from the other tool in positioning a workpiece betweenthe tools preparatory for a trimming operation, hydraulically actuatedmeans for operating said tool in performing the trimming operation onthe workpiece, said last named means being interposed between the tooland the rst named means, and said last named means being independenti-ymovable to compensate for movement of the tool by said rst named means.

20. The combination with two members at least one of which is movabletoward and from the other, of mechanism for imparting two movements, insequence and consonance with each other, to said movable member, a rstmovement to bring said members intooperative relation,

and a second movement to perform an operation, said mechanism comprisingmechanical means to effect said rst movement and means, interposedbetween said member and said mechanical means, and actuatedhydraulically and independently of said mechanical means, for effectingsaid second movement.

LOUIS H. MORIN.

